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COMMITMENTS AND CONTINGENCIES (Details)	Feb. 09, 2018 USD ($)	Jun. 30, 2019 USD ($) commitment	Dec. 24, 2018 USD ($)	Sep. 30, 2018 USD ($) commitment	Oct. 14, 2016 USD ($)
Loss Contingencies [Line Items]
Unfunded loan commitments		$ 1,010,000,000.00		$ 748,800,000
Number of investment commitments | commitment		1,700,000		1,400,000
Securities, buy (sell) obligations		$ 0		$ 0
Off-balance sheet credit exposures		$ 100,000		$ 100,000
Card Limited, LLC v. MetaBank dba Meta Payment Systems [Member]
Loss Contingencies [Line Items]
Estimate of possible loss					$ 4,000,000.0
AFS/IBEX, A Division of MetaBank V. Aegis Managing Agency Limited [Member]
Loss Contingencies [Line Items]
Damages sought amount	$ 1,600,000
Ohio Valley Bank Company V. Metabank dba Refund Advantage, Case No. 18 CV 134 [Member]
Loss Contingencies [Line Items]
Estimate of possible loss			$ 3,000,000.0

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